CN202000994U - Double far-field electromagnetic focusing thickness meter - Google Patents
Double far-field electromagnetic focusing thickness meter Download PDFInfo
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- CN202000994U CN202000994U CN2010206559929U CN201020655992U CN202000994U CN 202000994 U CN202000994 U CN 202000994U CN 2010206559929 U CN2010206559929 U CN 2010206559929U CN 201020655992 U CN201020655992 U CN 201020655992U CN 202000994 U CN202000994 U CN 202000994U
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Abstract
The utility model provides a double far-field electromagnetic focusing thickness meter, which comprises an emission unit and a reception unit. The emission unit comprises two transmitting coils. The reception unit comprises 40 groups of receiving coils. The two transmitting coils are symmetrically arranged at the two sides of the 40 groups of receiving coils. The 40 groups of receiving coils divided into two layers are uniformly distributed, that are 20 groups of receiving coils for each layer. The difference between two adjacent receiving coil groups in each layer is 18 degrees and the difference between two corresponding coil groups of the two receiving coil group layers is 9 degrees. Each group of coils is in a differential serial connection with each other. According to the thickness meter of the utility model, the electromagnetic field distribution of coils at the internal and external of a bushing is changed based on the electromagnetic field emission principle. Therefore, the measuring accuracy of the thickness meter is ensured and the resolution thereof in the horizontal direction is improved without utilizing any jogging systems. The structure of the thickness meter adopts far-field low-frequency dual emitters and an array receiving probe, so that the thickness meter is high in measurement precision and resolution in the horizontal direction. The thickness meter is simple in structure, thus is suitable for further production and popularization.
Description
[technical field]
The utility model relates to a kind of downhole logging instrument device, particularly a kind of logger of measuring well setting of casing wall thickness.
[background technology]
Now the thick instrument of magnetic survey commonly used has two kinds on the oil field, a kind of thick logging instrument MTT of magnetic survey (magnetic thickness tool) of the measuring well setting of casing wall thickness for the production of Sondex company.Another kind is (Э M Д C-TM-42TC) instrument that Russia produces.Two kinds of its measuring principles of the thick logging instrument of magnetic survey are the same substantially, all are to utilize electromagnetism whirlpool principle, and different is that (Э M Д C-TM-42TC) instrument that Russia produces adopts 4 coils to measure, and the instrument that Sondex company produces adopts 12 coils (backup) to measure.By contrast, because the instrument that Sondex company produces adopts the backup system, can make detection probe be close to the borehole wall, so the result of every probe measurement is more accurate, it is littler influenced by extraneous factor.But also, make the structure of instrument become complicated more owing to adopted the backup system.And, instrument resolution ratio is in the horizontal direction reduced because the backup arm that influences instrument of various factors can not a lot (have only 12) at present.
[utility model content]
The purpose of this utility model provides a kind of pair of far field electromagnetic and focuses on calibrator, to solve the problems of the technologies described above.
To achieve these goals, the utility model adopts following technical scheme:
A kind of pair of far field electromagnetic focuses on calibrator, comprises transmitter unit and receiving element, and described transmitter unit comprises two transmitting coils, and described receiving element comprises 40 group of received coils, and described two transmitting coils are symmetricly set in described 40 group of received coil both sides; Described 40 group of received coils divide two-layer even distribution, and 20 groups every layer, every layer of adjacent receiving coil group differs 18 °, and corresponding coil groups differs 9 ° between the two-layer receiving coil group, every group of coil differential series.
Distance between described two transmitting coils is 5-7 a times of measured sleeve bore.
The magnetic conduction sheet that the trade mark is 1J85 is equipped with in described transmitting coil inboard.
Described 40 group of received coils divide two-layer even distribution, form first receiving transducer and second receiving transducer; Described calibrator also comprises receiving circuit, and described receiving circuit comprises the bandpass filter of 40 road input amplifiers, 40 road 40HZ and the bandpass filter of 40 road 2HZ; The receiving coil of described first receiving transducer and second receiving transducer is connected corresponding input amplifier, and described input amplifier connects the bandpass filter of corresponding 40HZ and the bandpass filter of 2HZ.
Described calibrator also comprises two VGA amplifying circuits, two analog switching circuits and digital control circuit; Described two analog switching circuits connect the bandpass filter of corresponding 20 road 40HZ and the bandpass filter of 20 road 2HZ; Described two analog switching circuits connect corresponding VGA amplifying circuit; Described two VGA amplifying circuit linking number word control circuits.
Described calibrator also comprises the subsidiary circuit, and described subsidiary circuit connects described digital control circuit.
Described calibrator also comprises switching power circuit, and described switching power circuit connects the bandpass filter of described transmitter unit, receiving element, input amplifier, 40HZ, bandpass filter, analog switching circuit, VGA amplifying circuit, subsidiary circuit and the digital control circuit of 2HZ.
Compared with prior art, the utlity model has following advantage: the utility model is according to emission electromagnetic field principle, change the distribution of coil electromagnetism field inside and outside sleeve pipe, make instrument under the condition without the backup system, the certainty of measurement that promptly can satisfy instrument has improved the resolution ratio of instrument horizontal direction again.The utility model adopts the structure of two emissions of far field low frequency and array received probe, has the certainty of measurement height, the advantage that the resolution ratio of horizontal direction is high, and simple in structure be convenient to produce promote.
[description of drawings]
Fig. 1 is the utility model structural representation;
Fig. 2 is twin coil emission electromagnetic field distribution map;
Fig. 3 is two far fields magnetic energy signal distribution plots;
Fig. 4 A is the receiving transducer distribution map;
Fig. 4 B is another angle receiving transducer distribution map;
Fig. 5 is that two far field electromagnetic focus on the calibrator block diagram;
Fig. 6 is through hole and damaged slot wave deformation difference figure;
Fig. 7 is with the dark damaged groove measured waveform figure of wide difference;
Fig. 8 is with dark different wide damaged groove measured waveform figure;
Fig. 9 is through hole and damaged groove measured waveform figure.
[specific embodiment]
Below in conjunction with accompanying drawing the utility model is done and to be described in further detail.
The utility model provides a kind of pair of far field electromagnetic to focus on calibrator, is used for the logger of measuring well setting of casing wall thickness, and it mainly is made up of transmitter unit, receiving element and electronic circuit three parts.
See also shown in Figure 1ly, transmitter unit of the present utility model comprises two transmitting coils, and two transmitting coils are forward arranged with emission magnetic field, and coil is at a distance of the about 5-7 times of casing inner diameter of surveying.See also shown in Figure 1ly, the utility model is in order to obtain equally distributed magnetic field, and high magnetic conduction (1J85) sheet is equipped with in two transmitting coil inboards.See also shown in Figure 2ly, forward launch equal magnetic action with magnetic conduction sheet, make magnetic field inside and outside casing wall, form parallel even distribution by the twin coil set a distance.See also shown in Figure 3ly, the two far fields of the utility model focus on the sensor of calibrator, adopt two far-field emission, make magnetic field distribution even, and the measure error that makes instrument caused by Lift-off effect reduces.In addition, because sleeve pipe internal magnetic field intensity improves 5 times, make the detection sensitivity of instrument also improve 5 times.
See also shown in Fig. 4 A and Fig. 4 B, the utility model is for the Measurement Resolution and the sensitivity of the direction of improving the standard, 40 group of received coils have distributed on the instrument circumference, all receiving coils divide two-layer even distribution, 20 groups every layer, every layer of adjacent receiving coil group differs 18 °, and every group of coil adopts difference to link to each other.Corresponding coil groups differs 9 ° between two-layer, when by after the software delays, just is equivalent in one plane, and by 9 ° of uniform 40 group of received probes, the horizontal survey resolution ratio that makes instrument is 9 °.
See also shown in Figure 5ly, electronic circuit of the present utility model is made up of radiating circuit, receiving circuit (amplification filtering), digital control circuit, VGA amplifying circuit, subsidiary circuit, switching power circuit.
Radiating circuit: radiating circuit adopts the strong 40HZ sine wave of penetration capacity, and emissive porwer is 2 watts, and the inboard high magnetic conduction sheet magnetic conduction of 1J85 that adopts of transmitting coil makes Distribution of Magnetic Field even.
Receiving circuit: in order accurately to measure the variation of casing damage, receiving circuit is made up of the bandpass filter of 40 road input amplifiers, 40 road 40HZ and the bandpass filter of 40 road 2HZ.Like this, just can tell the difference of the through hole and the damaged groove of casing damage, also can quantitative measurment go out casing damage and quantitatively change.
Digital control circuit: be commander's part of instrument work, it makes instrument emission, reception, scale, measurement and orderly the carrying out of signal transmission by SECO.
Switching power circuit: its handle+18V direct current, the direct current that becomes 80V is used for transmitter unit; Become ± direct current of 15V uses for receiving element; Becoming 5V power supply electronic circuit uses.In order to improve conversion efficiency, adopt the Switching Power Supply conversion.
Subsidiary circuit: be used to measure temperature and inclination angle, orientation; Measuring temperature is to proofread and correct usefulness in order to carry out temperature drift, and measuring the inclination angle, orientation is in order to calculate the particular location of casing damage.
VGA amplifying circuit principal security received signal all is operated in linear condition; The effect of analog switching circuit be 80 road measuring-signals on request serial send to ground.
The utility model experiment effect:
Two far field electromagnetic focus on calibrator and are mainly used in the variation of measuring ferromagnetic casing wall thickness.Graduator adopts on sleeve pipe, pre-processed various damaged grooves and damaged through hole.Comprising the groove of same width different depth and the groove of same degree of depth different in width, comprise the through hole of different-diameter etc.
Fig. 6 is a method of distinguishing through hole and damaged slot wave deformationization, by the variation to measured waveform amplitude, width and waveform phase, can distinguish the degree of casing damage.
Experimental prototype is measured in processing damaged sleeve pipe in advance, and the result is as follows:
Fig. 7 is with the dark damaged groove measured waveform figure of wide difference; The damaged well width that sleeve pipe is processed in advance is 10mm, and the degree of depth is respectively 2,3,4mm.3,4.5,6mm actual measured results: the waveform width is 10mm, and amplitude is respectively:, be linear change substantially.
Fig. 8 is with dark different wide damaged groove measured waveform figure; The damaged groove depth that sleeve pipe is processed in advance is 4mm, and width is respectively 5,10,15mm.3,4.5,6mm measurement result: the waveform width is 10mm, and amplitude is respectively:, be linear change substantially.
Fig. 9 is through hole and damaged groove measured waveform figure, and measured waveform is found out: when 40HZ wave-shape amplitude during greater than the 2HZ wave-shape amplitude, casing damage is a groove; When 2HZ wave-shape amplitude during greater than the 40HZ wave-shape amplitude, casing damage is a through hole.
Instrument is when well logging, and all measured waveform all are transferred to ground instrument, and after handling through software, reducible is sleeve pipe actual spoilage figure again.
Claims (7)
1. two far field electromagnetic focus on calibrator, it is characterized in that: comprise transmitter unit and receiving element, described transmitter unit comprises two transmitting coils, and described receiving element comprises 40 group of received coils, and described two transmitting coils are symmetricly set in described 40 group of received coil both sides; Described 40 group of received coils divide two-layer even distribution, and 20 groups every layer, every layer of adjacent receiving coil group differs 18 °, and corresponding coil groups differs 9 ° between the two-layer receiving coil group, every group of coil differential series.
2. a kind of pair of far field electromagnetic focuses on calibrator according to claim 1, it is characterized in that: the distance between described two transmitting coils is 5-7 a times of measured sleeve bore.
3. a kind of pair of far field electromagnetic focuses on calibrator according to claim 1, and it is characterized in that: the magnetic conduction sheet that the trade mark is 1J85 is equipped with in described transmitting coil inboard.
4. a kind of pair of far field electromagnetic focuses on calibrator according to claim 1, and it is characterized in that: described 40 group of received coils divide two-layer even distribution, form first receiving transducer and second receiving transducer; Described calibrator also comprises receiving circuit, and described receiving circuit comprises the bandpass filter of 40 road input amplifiers, 40 road 40HZ and the bandpass filter of 40 road 2HZ; The receiving coil of described first receiving transducer and second receiving transducer is connected corresponding input amplifier, and described input amplifier connects the bandpass filter of corresponding 40HZ and the bandpass filter of 2HZ.
5. focus on calibrator as a kind of pair of far field electromagnetic as described in the claim 4, it is characterized in that: described calibrator also comprises two VGA amplifying circuits, two analog switching circuits and digital control circuit; Described two analog switching circuits respectively connect the bandpass filter of corresponding 20 road 40HZ and the bandpass filter of 20 road 2HZ; Described two analog switching circuits connect corresponding VGA amplifying circuit; Described two VGA amplifying circuit linking number word control circuits.
6. focus on calibrator as a kind of pair of far field electromagnetic as described in the claim 5, it is characterized in that: described calibrator also comprises the subsidiary circuit, and described subsidiary circuit connects described digital control circuit.
7. focus on calibrator as a kind of pair of far field electromagnetic as described in the claim 6, it is characterized in that: described calibrator also comprises switching power circuit, and described switching power circuit connects the bandpass filter of described transmitter unit, receiving element, input amplifier, 40HZ, bandpass filter, analog switching circuit, VGA amplifying circuit, subsidiary circuit and the digital control circuit of 2HZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206559929U CN202000994U (en) | 2010-12-13 | 2010-12-13 | Double far-field electromagnetic focusing thickness meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206559929U CN202000994U (en) | 2010-12-13 | 2010-12-13 | Double far-field electromagnetic focusing thickness meter |
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| CN202000994U true CN202000994U (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206559929U Expired - Fee Related CN202000994U (en) | 2010-12-13 | 2010-12-13 | Double far-field electromagnetic focusing thickness meter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373110A (en) * | 2014-11-04 | 2015-02-25 | 西安威盛电子科技股份有限公司 | Electromagnetic thickness measurement differential receiving probe |
| CN104481501A (en) * | 2014-11-04 | 2015-04-01 | 西安威盛电子科技股份有限公司 | Remote-field electromagnetic eddy current logging instrument and quantitative interpretation calibration method thereof |
| CN104564023A (en) * | 2014-12-18 | 2015-04-29 | 西安思坦仪器股份有限公司 | Non-contact type high-accuracy array electromagnetic thickness gauge |
| CN106842334A (en) * | 2016-12-12 | 2017-06-13 | 中国石油天然气集团公司 | A kind of electromagnetic exploration method and device |
| CN109782131A (en) * | 2019-01-28 | 2019-05-21 | 浙江工业大学 | A kind of near-earth formula self-powered overhead transmission line fault detection means |
-
2010
- 2010-12-13 CN CN2010206559929U patent/CN202000994U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104373110A (en) * | 2014-11-04 | 2015-02-25 | 西安威盛电子科技股份有限公司 | Electromagnetic thickness measurement differential receiving probe |
| CN104481501A (en) * | 2014-11-04 | 2015-04-01 | 西安威盛电子科技股份有限公司 | Remote-field electromagnetic eddy current logging instrument and quantitative interpretation calibration method thereof |
| CN104373110B (en) * | 2014-11-04 | 2017-05-24 | 西安威盛电子科技股份有限公司 | Electromagnetic thickness measurement differential receiving probe |
| CN104564023A (en) * | 2014-12-18 | 2015-04-29 | 西安思坦仪器股份有限公司 | Non-contact type high-accuracy array electromagnetic thickness gauge |
| CN104564023B (en) * | 2014-12-18 | 2017-11-28 | 西安思坦仪器股份有限公司 | Non-contact type high-precision array electromagnetic thickness tool |
| CN106842334A (en) * | 2016-12-12 | 2017-06-13 | 中国石油天然气集团公司 | A kind of electromagnetic exploration method and device |
| CN109782131A (en) * | 2019-01-28 | 2019-05-21 | 浙江工业大学 | A kind of near-earth formula self-powered overhead transmission line fault detection means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111005 Termination date: 20191213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |